diff --git a/include/minix/callnr.h b/include/minix/callnr.h
index 2f005e3a1..c1b9bf5d9 100755
--- a/include/minix/callnr.h
+++ b/include/minix/callnr.h
@@ -64,9 +64,10 @@
 
 #define REBOOT		  76
 
-/* MINIX specific calls to support system services. */
+/* MINIX specific calls, e.g., to support system services. */
 #define SVRCTL		  77
 #define CMOSTIME	  78
 #define GETSYSINFO	  79	/* to MM or FS */
+#define GETPROCNR         80    /* to MM */
 
 #define FSTATFS	 	  82
diff --git a/include/minix/com.h b/include/minix/com.h
index 18716d637..ca7ef32ce 100755
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -11,6 +11,7 @@
 #define SEND		 1	/* function code for sending messages */
 #define RECEIVE		 2	/* function code for receiving messages */
 #define BOTH		 3	/* function code for SEND + RECEIVE */
+#define NOTIFY		 4	/* function code for notifications */
 #define NB_SEND 	(SEND | NON_BLOCKING)	  /* non-blocking SEND */
 #define NB_RECEIVE	(RECEIVE | NON_BLOCKING)  /* non-blocking RECEIVE */
 
@@ -71,13 +72,16 @@
  * blocking notifications are delivered. The lowest numbers go first. The
  * offset are used for the per-process notification bit maps. 
  */
-#define NR_NOTIFICATIONS 	  5	/* number of bits in notify_mask_t */
-#	define NOTIFICATION 	333 	/* offset for notification types */
-#	define HARD_INT	    NOTIFICATION + 0	/* hardware interrupt */
-#	define SYN_ALARM    NOTIFICATION + 1  	/* synchronous alarm */
-#	define KSIG_PENDING NOTIFICATION + 2  	/* signal(s) pending */
-#	define NEW_KMESS    NOTIFICATION + 3  	/* new kernel message */
-#	define HARD_STOP    NOTIFICATION + 4  	/* system shutdown */
+#define NOTIFICATION  		  0x0800 	/* flag for notifications */
+#  define HARD_INT     (NOTIFICATION | 0)	/* hardware interrupt */
+#  define SYN_ALARM    (NOTIFICATION | 1)  	/* synchronous alarm */
+#  define KSIG_PENDING (NOTIFICATION | 2)  	/* signal(s) pending */
+#  define NEW_KMESS    (NOTIFICATION | 3)  	/* new kernel message */
+#  define HARD_STOP    (NOTIFICATION | 4)  	/* system shutdown */
+#define NR_NOTIFY_TYPES    	       5	/* nr of bits in mask */
+
+/* Shorthands for message parameters passed with notifications. */
+#define NOTIFY_ARG	m2_l1			/* passed for some types */
 
 
 /*===========================================================================*
diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index d1646b90a..02349fce1 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -94,12 +94,14 @@ typedef struct {
 #define sendrec		_sendrec
 #define receive		_receive
 #define send		_send
+#define notify		_notify
 #define nb_receive	_nb_receive
 #define nb_send		_nb_send
 
 _PROTOTYPE( int sendrec, (int src_dest, message *m_ptr)			);
 _PROTOTYPE( int receive, (int src, message *m_ptr)			);
 _PROTOTYPE( int send, (int dest, message *m_ptr)			);
+_PROTOTYPE( int notify, (int dest, message *m_ptr)			);
 _PROTOTYPE( int nb_receive, (int src, message *m_ptr)			);
 _PROTOTYPE( int nb_send, (int dest, message *m_ptr)			);
 
diff --git a/include/minix/type.h b/include/minix/type.h
index 10fe1d064..6b53612af 100755
--- a/include/minix/type.h
+++ b/include/minix/type.h
@@ -102,6 +102,19 @@ struct kinfo {
   phys_bytes bootdev_size;
   phys_bytes params_base;	/* parameters passed by boot monitor */
   phys_bytes params_size;
+  long notify_held;
+  long notify_blocked;
+  long notify_switching;
+  long notify_reenter;
+  long notify_ok;
+  long notify_unhold;
+  long notify_int;
+  long notify_alarm;
+  long notify_sig;
+  long notify_kmess;
+  long notify_stop;
+  int nr_procs;			/* number of user processes */
+  int nr_tasks;			/* number of kernel tasks */
   char version[8];		/* kernel version number */
 };
 
diff --git a/servers/pm/misc.c b/servers/pm/misc.c
index fe3428d60..983435e38 100644
--- a/servers/pm/misc.c
+++ b/servers/pm/misc.c
@@ -4,6 +4,7 @@
  *   do_reboot: kill all processes, then reboot system
  *   do_svrctl: process manager control
  *   do_getsysinfo: request copy of PM data structure
+ *   do_getprocnr: get process slot number (like getpid)
  */
 
 #include "pm.h"
@@ -30,6 +31,15 @@ PUBLIC int do_getsysinfo()
 }
 
 
+/*=====================================================================*
+ *			    do_getprocnr			       *
+ *=====================================================================*/
+PUBLIC int do_getprocnr()
+{
+  return(OK);
+}
+
+
 /*=====================================================================*
  *			    do_reboot				       *
  *=====================================================================*/